Air heater for ranges



Nov. 5, 1940. G. D. BOBOIAN AIR HEATER FOR RANGES Filed Nov. 13, 1939 2 Sheets-Sheet 1 47am 0r.- 3 96125061107: mam

Nov. 5, 1940. G. D. BOBOIAN AIR HEATER FOR RANGES 2 Sheeis-Sheet 2 Filed Nov. 13, 1339 iarz Gear

Patented Nov. 5, 1940 UNITED I STATES PATENT orrlca 2,220,887 AIR. nna'rsn roa mess George D. Boboian, Worcester, Mass.

Application November 18, 1939, Serial No. 304,039

12 Claims. (o1. 126-4) The present invention relates to a device for heating and circulating air froma kitchen range adapted for burning oil or other solid or fluid fuel,

' and is particularly adapted for heating and circulating air without interfering with the normal functions of the stove in any way, and without permitting intermingling of the products of combustion with the air to be circulated.

In the use of kitchen ranges for heating as well as cooking, it has been invariably necessary to depend entirely upon the radiation of heat from the stove surfaces for heating the room.. In accordance with the present invention, air is heated by the stove and is then circulated from the stove so that convection currents of air throughout the room are established. The stove is designed so that the duct through which the air passes to be heated does not interfere with the use of the top of the stove or the oven for go cooking.

A further feature of the invention resides in the provision of a positive circulation of air for heating through the stove, and this arrangement may also incorporate, if desired, a provision for 35 filtering and moistening the air.

Other and further objects and advantages of the invention will more fully appear from the following detailed description taken in connection with the accompanying drawings, in which- Fig. l is a plan view of a stove in which the invention is incorporated.

Fig. 2 is a sectional view along the line 2-2 of Fig. 1.

Fig. 3 is a fragmentary sectional view along the.

35 line 3-3 of Fig. 1.

Fig. 4 is a sectional view substantially along the line |4 of Fig. 2.

With reference first to Fig. 1, the stove or range has a top I, a front 2, side walls 3 and l, and a rear wall 5. The fire box 6 of the stove has, in the arrangement shown, spaced oil burner units 1 adapted for heating the top of the stove, as well as an oven 8, Fig. 2. It will be understood that fumes from the oil burners are directed up under the top i of th stove and are discharged either through an opening 9 communicating directly with the chimney, or through an opening "I beneath the bottom wall of the oven, this latter opening being utilized when the opening 9 is 543 closed to direct the products of combustion around the oven, as shown by the dotted arrows. The top wall I of the cook stove is substantially flat for the support and heating of cooking utensils placed thereon; thus the air heating device de- 55 scribed is especially applicable to kitchen ranges and cook stoves without affecting their usefulness for cooking.

As best shown in Fig. 4, the air duct I I, through which the air for heating is circulated, is positioned between the units 1 and is so shaped in 5 cross section as to utilize all possible heat from the units without interfering with the satisfactory heating of the top of the stove. In the arrangement shown, the duct II is narrow at the center and considerably larger at the ends for 10 the passage of as great amount of. air as possible. If desired, heating plates 12 may be positioned within the duct for a more thorough heating of the air as it passes upwardly therethrough.

The duct ii at the top is connected by an elbow l5 II to a lateral duct it which extends across the oven, and which has its upper surface a spaced from the top of the stove so that the passage of heat directly from the burners to the top of the stove for heating the latter willnot be interfered with. The duct ll extends to an opening IS in the side wall 3 of the stove, at which point the heated air is discharged into the atmosphere.

It will be noted from Fig. 2 that the lower end of the duct I i extends below the bases of the 26 burner 'l, and is open to allow the upward movement of cold air from adjacent the floor of the room in which the stove is located.

For a more positive circulation of air, the lower end of the duct may have mounted therein, as 30 shown in Fig. 3, an electrically driven fan It which increases the rate of movement of air through the duct and out of the opening l5 into the room. Associated with the fan may be a suitable filter I], if desired, for removing dust and dirt, and this filter may be moistened from a suitable pipe l8, in order that the air passing therethrough may be dampened to increase the relative humidity of the atmosphere. It will be understood that moistening may be accomplished by other means than by applying water to the filter, and moistening the filter is merely an indication of one way by which moistening of the heated air may be done.

In some instances, it may be desirable to direct the hot air out at the back of thestove rather than at the side, in which event the duct It may be curved to communicate with an appropriate opening provided in either the front or rear walls of the stove, as will be readily apparent.

For some types of oven cooking, it may be desirable to provide for heating the oven directly with the hot air from the duct I I. For this purpose, the bottom wall of the duct II has a damper 2| therein which normally closes an opening 22 as into the oven. When the damper is swung into the dotted line position of Fig. 2, by means of a handle 23 on the forward end of a pin 24 on which the damper is mounted, air from the duct ll passes directly into the oven. Escape of cold air in the open is possible through openings 25' in the bottom of the oven door 25, a slide damper 26 being provided for closing the openings.

Thesame mechanism may be utilized for cooling down the stove in hot weather after the cooking has been done for the day. As is well known, the usual oil-heated cook stove holds its heat for a long period of time and as a result considerably overheats the kitchen. In accordance with the present invention, the duct I may be opened up into the space beneath the top of the stove by means of a damper 21 located in the top wall Ila. When this damper is opened, as by means of a handle 28 on the end of a pin 29 on which the damper is mounted, air is circulated through the duct II and into the chimney through the opening 9 or through the opening I0 below the oven. The fan I6 aids in insuring a circulation of air in this manner, and thus discharges the hot air within the stove into the chimney and effectively cools down the entire stove in a very short period of time.

It will be understood that when the stove is not in operation in hot weather that the fan 16 may be used for circulating cool air within the room and will provide for effective cooling of the room since it will draw cool air from adjacent the floor and discharge it at a substantially higher point. The structure for moistening the air may also be used with the fan in cooling and moistening the air in hot weather.

Although the device has been shown as applicable to an oil stove, it will be understood that it may be applied equally well to a combination stove in which oil or other fuel is burned at one end of the stove and the other end has electrical heating units or other types of units. In this arrangement the duct It may communicate with either the front or rear wall of the stove adjacent to the fire box 6 so that the duct will not interfere with the heating units at the opposite end of the stove from the fire box.

I claim:

1. The combination with a cook stove or range having a fire box, vertical side walls and a substantially fiat top wall above the fire box for the support and heating of cooking utensils positioned thereon, the top wall being heated from the fire box, of a duct passing upwardly through the fire box and laterally beneath the top wall of the stove, said duct communicating with an opening in one of the vertical walls of the stove and said duct beneath the fire box being open to provide for the passage of air therethrough.

2. The combination with a cook stove or range having a fire box, vertical side walls and a substantially fiat top wall above the fire box for the support and heating of cooking utensils positioned thereon, the top wall being heated from the fire box, of a duct passing upwardly through the fire box and laterally beneath the top wall of thestove, said duct communicating with an opening in one of the vertical walls of the stove and said duct beneath the fire box being open to provide for the passage of air therethrough and a fan in said duct for the positive circulation of air through the duct.

3. The combination with a cook stove or range having a fire box, vertical side walls and a substantially fiat top wall above the fire box fo the support and heating of cooking utensils positioned thereon, the top wall being heated from the fire box, of a duct passing upwardly through the fire box and laterally beneath the top wall of the stove, said duct communicating with an opening in one of the vertical walls of the stove and said duct beneath the fire box being open to provide for the passage of air therethrough, and a filter in said duct.

4. The combination with a cook stove or range having a fire box, vertical side walls and a substantially fiat top wall above the fire box for the support and heating of cooking utensils positioned thereon, the top wall being heated from the fire box, of a duct passing upwardly through the fire box and laterally beneath the top wall of the stove, said duct communicating with an opening in one of the vertical walls of the stove and said duct beneath the fire box being open to provide for the passage of air therethrough, a fan in said duct for the positive circulation of air through the duct and a filter in said duct.

5. The combination with a cook stove or range having a fire box, vertical side walls and a substantially fiat top wall above the fire box for the support and heating of cooking utensils positioned thereon, the top wall being heated from the fire box, of a duct passing upwardly through the fire box and laterally beneath the top wall of the stove, said duct communicating with an opening in one of the vertical walls of the stove and said duct beneath the fire box being open to provide for the passage of air therethrough, a filter in said duct, and means for moistening the air as it passes through said duct.

6. The combination with a stove having a fire box. an oven within the stove and around which heat from the fire box is circulated, of a duct extending upwardly through the fire box and communicating with an opening within one of the vertical walls of the stove, said duct being open beneath the fire box for the admission of air thereto, and means associated with the duct for directing air from said duct into the oven.

7. The combination with a stove having a fire box, an oven within the stove and around which heat from the fire box is circulated, of a duct extending upwardly through the fire box and communicating with an opening within one of the vertical walls of the stove, said duct being open beneath the fire box for the admission of air thereto, and means associated with the duct for directing air from said duct into the oven, said oven having an opening in one wall thereof for the escape of air therefrom when air from the duct is directed into the oven.

8. The combination with a stove having a. fire box therein, of a duct positioned within and extending upwardly through the fire box, with its upper end communicating with an opening in one of the vertical walls of the stove and a normally closed damper in said duct adapted when open to direct air within the duct into the space beneath the top of the stove.

9. The combination with a stove having a fire box and a space beneath the top of the stove into which the fumes from the combustible material in the fire box are directed for heating the top of the stove. one of the walls of the stove having an opening for the discharge of gases from beneath the stove top, of a duct passing upwardy through the fire box and communicating with an opening in one of the side walls of the stove, and a normally closed damper in said duct adapted when open to discharge air from within that said duct to the space beneath the top of the stove.

10. The combination with a stove having a fire box and a space beneath the top of the stove into which the fumes from the combustible material in the fire box are directed for heating the top of the stove, one of the walls of the stove having an opening for the discharge of gases from beneath the stove top, of a duct passing upwardly through the fire box and communicating with an opening in one of the side walls of the stove, a fan in said duct, and a normally closed damper in said duct adapted when open to discharge air from within that said duct to the space beneath the top of the stove.

11. The combination with a cook stove or range having a substantially fiat top wall for the support and heating of cooking utensils, substantially vertical side walls, a fire box beneath the top wall and a pair of spaced oil burner units positioned within the fire box, the top of the stove having a space therebeneath into which the fumes from the units are directed for heating the stove top, of a duct extending upwardly through the fire box between the burner units, the upper end of said duct communicating with an opening in one of said walls of the stove for the escape of air therefrom, the lower end of the duct beneath the fire box being open.

12. The combination with a stove having a fire box therein and a pair of spaced oil burner units positioned within the fire box, the top of the stove having a space therebeneath into which the fumes from the units are directed for heating the stove top, of a duct extending upwardly through the fire box between the burner units, and a laterally extending duct positioned beneath and spaced from the-stove top and providing a connection between the upper end of said first duct and an opening in one of the side walls of the stove for the escape of air therefrom.

GEORGE D. BOBOIAN. 

